问题补充：
—How do you go to school every day?
—I , but I by bike a year ago.
A. go to school by foot; went
B. would go to school on foot; liked to go
C. walk; used to go
D. will walk to go school; was used to going
答案：
A. go to school by foot; went
B. would go to school on foot; liked to go
(答案→)C. walk; used to go
D. will walk to go school; was used to going
解析：根据语境可知此句的含义我现在是走着去上学，而以前是骑自行车去上学。考查的是固定句型结构used to do sth表示过去常常做某事，现在不做了。现在经常做的事情要用一般现在时，故选C。
